$ sudo gem install mysql — –with-mysql-config=/usr/local/mysql/bin/mysql_config
Building native extensions. This could take a while…
ERROR: Error installing mysql:
ERROR: Failed to build gem native extension.

/opt/local/bin/ruby extconf.rb –with-mysql-config=/usr/local/mysql/bin/mysql_config
checking for mysql_ssl_set()… no
checking for rb_str_set_len()… no
checking for rb_thread_start_timer()… no
checking for mysql.h… no
checking for mysql/mysql.h… no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Provided configuration options:
–with-opt-dir
–without-opt-dir
–with-opt-include
–without-opt-include=${opt-dir}/include
–with-opt-lib
–without-opt-lib=${opt-dir}/lib
–with-make-prog
–without-make-prog
–srcdir=.
–curdir
–ruby=/opt/local/bin/ruby
–with-mysql-config

Gem files will remain installed in /opt/local/lib/ruby/gems/1.8/gems/mysql-2.8.1 for inspection.
Results logged to /opt/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/ext/mysql_api/gem_make.out

please help me out of here..
thanks